Grizzly for ore separation



' W. ROSS. VGRIZZLY F 0R ORE SEPARATION.

APPLICATION FILED APR. 27 19,17. RENEWED JAN. 10, 1919.

Patented NOV. 11, 1919.

2 SHEETSSHEET l- MIR .dwwwl JNVENTUR.

W. ROSS.

GRIZZLY FOR ORE SEPARATION.

APPLICATION FILED APR-27.1917- RENEWED JAN. 10. 1919.

1,321,773. Patented Nov. 11, 1919.

2 SHEETS-SHEET 2.

WILLIAM ROSS, OF SOUTH PORCUIPINE, ONTARIO, CANADA.

GRIZZLY FOR ORE SEPARATION.

Specification of Letters Patent.

Patented Nov. 11, 1919.

Application filed, April 27, 1917, Serial N 0. 164,952. Renewed January 10, 1919. Serial No. 270,589.

To all whom it may concern:

Be it known that I,. WILLIAM Ross, of South Porcupine, in the district of Algoma, Province of Ontario, Canada, have invented certain new and useful Improvements in Grizzlies for Ore Separation, of which the following is a specification.

This invention relates to what are commonly known as grizzlies, that is, coarse screens formed of horizontal bars linked togetherand traveling in a closed orbit. In

by me material which falls through the upper bars, falling on the lower bars and collecting there, and my object is to devise a grizzly in which the spacing of the bars is automatically increased when moving at the underside of the apparatus and to obtain in such an arrangement a maximum of grizzling space at the upper side anda maximum of escape space at the lower side in proportion to the non-grizzling surface.

I attain my object by means ofthe constructions hereinafter described and as illustrated in the-accompanying drawings in which I Figure l'is a vertical section showing a grizzly constructed in accordance with my invention:

Fig. 2 a plan View of the same;

Fig. 3 a vertical section of a modified form;

Fig. 4 a. plan view of part of the same;

Fig. 5 a detail in elevation partly in section of a further modification; and

Fig. 6 a view similar to Fig. 5 showing a modification of the construction shown in Figs. 3 and 4.

In the drawings like numerals of reference indicate corresponding parts in the different figures.

Referring particularly to Fig. 1, 1 is a shaft on which are keyed circular disks 2, in which are journaled-the main bars 3 of the grizzly. The shaft 1 will, of course, be j ournaled so that the bars 3 are substantially horizontal.

4 are intermediate bars which are so supported that at the top of the apparatus they will occupy a position between and substantially in alinement with the other bars, and so that when at the under side they fall awav from such positions so as to increase the clearance space at the lower side of the grizzly.

In Fig. 5 a simple arrangement for thls using such screens much trouble is caused the links 6 to the main barsas shown. Suit-' able means must be provided to hold intermediate bars in place at the upper side of the apparatus while permitting them to fall away as shown at the lower part of the apparatus. Disks 7 are connected to the shaft 1 for this purpose. Onthese disks the ends of the intermediate bars rest when at the upper side of the apparatus as shown.

8 is a chute adapted to discharge the ores or other crushed materials ,to the grizzly and 9 is a discharge chute into which the coarse material is discharged, the fines passing through the grizzly to a suitable receptacle or conveyor (not shown.)

In the form shown in Figs. 1 and 2, the bars move. in a closed circular orbit. It is often necessary, however, to providefgreater screening surface and this is done by causing the bars to move in an elongated orbit with its major axis substantially horizontal. In Figs. 3 and 4 such an arrangement is shown. 10 are two pairs of suitabl mount- ,ed sprocket wheels carrying the ciains 11.

On these chains the main bars 3 are supported, preferably by being pivoted thereto.

v From the main bars 3 the intermediate bar-s 4 are swung by means of the links 6. Means must be provided to hold the intermediate bars in position between the main bars at the top of the apparatus and to leave them free to hang down atthe bottom of the apparatus. In Figs. 3 and 4 I show the ends of the intermediate bars notched or cut out to rest on pins 12 secured to the chains intermediate the main bars. Where the bars travel horizontally at the upper part of the apparatus suopporting tracks 13 are preferably provide In Fig. 6 I show a further modification. In this construction I employ sprocket wheels at the discharge end of the apparatus with the teeth spaced so as to engage the main bars only, and adjacent to each wheel I proyide a disk 14 adapted to engage the intermediate bars between the teeth of the sprockets and push out the intermediate bars as shown, thus insuring their prompt fall as they pass around the wheel; In thls case I also show the intermediate bars without notches but adapted to rest .in saddleshaped supports 15 secured to the links of the chain.

In all the constructions shown a screening surface is provided at the top of the apparatu ofclosely set spaced bars; which at the under side of the apparatus shift their position so as to increase the spacing and thus facilitate the discharge of the fine materials passing through the upper part of the grizzly.

To prevent elongated pieces of material passing through the grizzly, I provide wires or chains 16 secured to a cross bar 17, pref erably located beneath the chute 9. These wires pass over'the upper bars as shown in Fig. 1 and have weights 18 hung at their lower ends, which give them sutficient ten-' sion to'hold them in position without producing undue friction on the moving bars.

Both the main and intermediate bars are preferably round or approximate circles in cross sections, though such cross sections may have the form of any equal sided equiangular figure and still approximate the advantages of the circular form. lVhat I claim as my'invention is:

l. A rotary grizzly comprising a shaft; pair of disks secured to the shaft; main grizzly bars journaled in said disks; a pair of links connected with said bars; intermediate bars connected to said links and I adapted to swing betweenthe said disks;

and meansconnected withthe shaft limit-- ing the movement of the intermediate bars ner limit of movement, they occupy positions intermediate the main bars and spaced therefrom.

2. A rotary grizzly comprising a shaft; a plurality of equally spaced main grizzly bars supported from said shaft parallel thereto and equidistant therefrom; intermediate bars supported so as to be movable toward or away from said shaft; and means connected with the shaftlimiting the movement of the intermediate bar toward the shaft whereby, when at their inner limit of movement, they occupy positions intermediate the main' bars and spaced therefrom. v

3. A rotary grizzly comprising a shaft; a pair of disks secured to the shaft; round main grizzly bars journaled in said disks; a pair of links connected with said bars, round intermediate bar connected to said links and adapted to swing between the said disks; and means connected with the shaft limiting the movement of the intermediate bars toward the shaft whereby, when at their inner limit of movement, they occupy .toward the shaft whereby, when at their in-.

ner limit of movement, they occupy positions lntermedlate the mam bars and spaced therefrom.

5. 'In a grizzly in which a series of substantially horizontal bars are connected and supported to move in a closed orbit and alternative bars are arranged to move to increase the spacing of the bars when they are at the underside of the orbit, a construction in which the alternate or movable bars are connected by links to swing from I the other or main bars and means are protoward the shaft whereby, when at thelr 1nvided for supporting the intermediate bars so that when at the upper "side of the ap-o paratus they lie between the main bars and are spaced equally therefrom and'when at the underside hang below the main bars. 

